Y07.420 Foster father, perpetrator of maltreatment and neglect

The ICD-10-CM code for Foster father, perpetrator of maltreatment and neglect is Y07.420 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

20: External causes of morbidity (V00-Y99)

Section

X92-Y09: Assault (X92-Y09)

Category Y07

61 codes (45 billable)

FY2026 Status

Stable since FY2024

U.S. Hospital Utilization

Y07.420 appeared in too few sampled U.S. inpatient stays in 2018 to report a national estimate (AHRQ suppresses counts of 10 or fewer) — a rare inpatient diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Confirmed: add assault external cause and perpetrator; suspected: do not

For cases of confirmed abuse or neglect an external cause code from the assault section (X92-Y09) should be added to identify the cause of any physical injuries. A perpetrator code (Y07) should be added when the perpetrator of the abuse is known. For suspected cases of abuse or neglect, do not report external cause or perpetrator code.

Used with any code in range A00.0-T88.9, Z00-Z99

1) Used with any code in the range of A00.0-T88.9, Z00-Z99 An external cause code may be used with any code in the range of A00.0-T88.9, Z00-Z99, classification that represents a health condition due to an external cause. Though they are most applicable to injuries, they are also valid for use with such things as infections or diseases due to an external source, and other health conditions, such as a heart attack that occurs during strenuous physical activity.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)